If someone could help me with what this involves, I'd be grateful.

I don't have a bench grinder but I am prepared to buy an angle grinder if this would do the job. Are there any alternatives? Is just filing it manually feasible?

When using a power grinder what sort of wheel should be used?

Does the heat generated by power grinding affect the tempering of the steel?

A lot of questions, I know, but I'm a complete novice who has two Weihrauchs with cut springs, and IŽd rather do the job myself than trust it to others. Most people out here know even less than me about airguns.

If the guns function OK, is it really necessary to deal with a cut spring?

Mine shoot accurately enough, but I've read that a cut spring can damage a gun over time.

If this is the case, then I'm surprised that a quality manufacturer like Weihrauch would even contemplate such a silly cost cutting exercise.

I am aware that the later models come with a properly finished main spring.